But it's not the war the rest of the realm agreed to start.
Tough to imagine Sorraine suddenly stopping a war they were winning without taking Sasrhas. Especially since they attacked Sasrhas.
I get that the forums are mostly propaganda but this one is tough to swallow IC or OOC. It doesn't even make sense: if you were going to take a diplomatic hit for starting a war with a casus bellus nobody accepted to begin with why would you leave a 2-region realm guaranteed to hold a grudge on your flank?